Lower thread bobbin for sewing machine

Abstract

The present invention relates to a lower thread bobbin for a sewing machine able to hold a thread, the bobbin comprising a crescent moon-shaped winding part on which a thread can be wound and a crescent moon-shaped securing part for covering the winding part on which the thread has been wound. The lower thread bobbin for a sewing machine has the advantage of being able to hold a greater amount of a lower thread than the very limited amount of a lower thread that is wound on general conventional bobbins, and so increasing the efficiency of sewing work as the user or sewing machinist does not replace the bobbin frequently.

The invention claimed is: 
     
       1. A lower thread bobbin for a sewing machine capable of holding a thread, the lower thread bobbin comprising:
 a crescent moon-shaped winding part for winding the thread thereon, wherein the crescent moon-shaped winding part include a flat strip of material; and 
 a crescent moon-shaped securing part for covering the winding part on which the thread has been wound. 
 
     
     
       2. The lower thread bobbin for a sewing machine according to  claim 1 , wherein the winding part and the securing part are made of a metal material. 
     
     
       3. The lower thread bobbin for a sewing machine according to  claim 1 , wherein the securing part include another flat strip of material.